Flying
Whenever Nightmare Dragon deals damage to a player, each player discards his or her hand and draws that many cards.
, Discard a card: Nightmare Dragon deals 1 damage to target creature or player.

Hee. Dragon Mage with a very pleasingly synergistic ability. It might be possible to make this go infinite, but it'd need enough work that I think it's fine. Very good with Underworld Dreams / Kederekt Parasite - if you land the combo with 5 cards in hand when the opponent has 4, that's an immediate 20 damage - but that's probably not too much of a problem.

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